package com.atguigu.gulimall.cart.interceptor;

import com.atguigu.common.vo.MemberResponseVo;
import com.atguigu.gulimall.cart.to.UserInfoTo;
import org.apache.commons.lang.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import java.util.UUID;

import static com.atguigu.common.constant.AuthServerConstant.LOGIN_USER;
import static com.atguigu.common.constant.CartConstant.TEMP_USER_COOKIE_NAME;
import static com.atguigu.common.constant.CartConstant.TEMP_USER_COOKIE_TIMEOUT;

/**
 * @ ClassName CartInterceptor
 * @ Description TODO
 * @ Author admin
 * @ Date 2021/3/29 14:53
 * @ Version 1.0
 */
public class CartInterceptor implements HandlerInterceptor {

    public static ThreadLocal<UserInfoTo> toThreadLocal = new ThreadLocal<>();

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();
        HttpSession session = request.getSession();
        MemberResponseVo memberResponseVo = (MemberResponseVo) session.getAttribute(LOGIN_USER);

        if (memberResponseVo != null) {
            //用户登录了
            userInfoTo.setUserId(memberResponseVo.getId());
        }

        Cookie[] cookies = request.getCookies();
        if (cookies!=null && cookies.length>0){
            for (Cookie cookie : cookies) {
                if (TEMP_USER_COOKIE_NAME.equals(cookie.getName())) {
                    userInfoTo.setUserKey(cookie.getValue());
                    //设置为非第一次用户
                    userInfoTo.setTempUser(true);
                }
            }
        }

        //如果浏览器没有这个参数,说明是第一次访问
        if (StringUtils.isEmpty(userInfoTo.getUserKey())){
            String uuid = UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }
        toThreadLocal.set(userInfoTo);
        return true;
    }

    /**
     * 业务执行完,判断是否是第一次访问购物车,是的话就给cookie一个有效期
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
//获取当前用户的值
        UserInfoTo userInfoTo = toThreadLocal.get();

        //如果没有临时用户一定保存一个临时用户
        if (!userInfoTo.getTempUser()) {
            //创建一个cookie
            Cookie cookie = new Cookie(TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
            //扩大作用域
//            cookie.setDomain("gulimall.com");
            //设置过期时间
            cookie.setMaxAge(TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }

    }
}
